not consistant but at times bucks/jerks and wants to shut off, you can turn it off then back on and it temp, solves it for a little while but getting worse, more often, im not usually a ford person so im lost, not check engine light or anything , i need help!! thanks

 

Start with the basics... Did you change the fuel filter yet?

Bucks/jerks = A hard misfire or lack of fuel deal...?


Tell lil Jerry, Jeff said what up?!?!

 

Test the coil packs,
fuel filters
spark plugs
plug wires/boots (Condensation or water down in there?)
vacuum leaks or any exhaust leaks?.


When was the last time it saw a 'real' tune up other than an oil change?

Check the basics.

Hurst

 

Listen to hurst the coil packs go bad on these frequently.

 

when does it do it? More in the morning when its dead cold? Once its warmed up?

 

HMM....Dont drive over potholes!!! lol --- Got anything more than bucking & jerking? What Speed/R.P.M does it start? Is there any unusual smells or sounds? Etc.. etc.. The more info you give the faster we can pin point the issue.

But in the mean time hurst is right... Check the basics Everything Fuel & Spark!

Anything in the spark. Dept could be bad. Plugs are bad (or not gapped properly), Coils are bad, timing is off, Plug wires are bad.

Or your not getting fuel to the motor...Thus the fuel filter being dirty... or your fuel pump could be goin out,You could have garbage in your fuel, your fuel lines are restricted, Injectors are dirty,

or even a vacuum leak, your Egr could be leaking or your compression is wacked. Do you a compression test..

 

bet it's a coil

 

well , here is the long version, my wifes dad bought this truck for her to come visit him more often, he lives in agusta georgia, we live in brandon (450+ miles) so he buys this truck , body /interior/ engine compartment look great, but he is older and unable to check under the truck... so anyway he bought it, then noticed it had a fuel leak from the tank, he took it to the shop and they told him it was a truck from up north, and the truck was pretty rusty but minor under it, only frame and minor things no body cancer, so they replaced the fuel tank, oil change, rotate and balance the tires and notice the transmission lines leaking so the replaced them as well, topped the tranny off and threw a couple gallons of gas in,,, everything is fine no leaks, runs good. i drive it around town for 2 days runs good until im heading back through town, it starts acking like its running out of gas, bucking jerking and slowing down so i pat and play with the gas pedal getting it up to speed to limp home to his house, next morning cranks right up runs fine, take it back to the shop they check fuel psi and everything is normal, no problems but he said put seafoam additive, and fill up the tank , so then thats done, we head back to florida, thing runs like a champ, we get 50 miles from home on the interstae and just below 1/4 tank of gas and it starts bucking and jerking again, well it stalls , so i pull over turn it off, turn it on and it starts right up so i take off and about 10 to 15 miles it did it again, well it limped home, next day runs fine to gas station, i fill it up, runs fine , within 15 minutes starts bucking jerking like its running out of fuel again, well as i know now, turn it off and start it again while going down the road, and its fine for a temp time 10 to 15 miles, and is getting worse by the day, coil pack? i dont think that if its getting hot and the windings in the coil breaking down by restarting it would not change that, plugs? it runs to good if its the plugs it would be more consistant, fuel filter possable!! morning/afternoon doesnot affect it, its done it both ways! its like a lack of fuel, but psi has been checked and no issue?? thanks for all the inputs im still working on it daily to try and find this,,, thanks guys.

 

Definatly sounds like a fuel issue. Could be a pump, pickup, filter, regulator issue. These fuel issues are a pain but persistence will pay off.

 

Take fuel filter off, can you blow through it? If there is any resistance put a new filter on. If the filter is clogged, it will make the pump work harder under driving conditions. Would explain why fuel psi is normal at a shop sitting idleing....most shops dont test fuel psi drving down the road....basic senario, fuel pump works harder than usual. It gets hot starts amping out and eventually kicks the relay. Wait 10 mins truck runs good again, until pump gets hot again. Also. Gas in the tank helps cool the pump, running it low compounds the problem.